Remove unused CSS selectors. (#181)

src/lib/chat/MatrixTimeline.svelte

@@ -177,9 +177,6 @@
 <style lang="scss">
   $border-radius: 16px;
 
-  h2 {
-    height: min-content;
-  }
 
   .input {
     border: 1px solid var(--md-sys-color-outline);
@@ -223,21 +220,6 @@
     width: 100%;
   }
 
-  .back-to-present {
-    position: fixed;
-    bottom: 0;
-  }
-
-  .scroll-controls {
-    position: sticky;
-    bottom: 0;
-    min-height: 16px;
-    background: linear-gradient(
-      to bottom,
-      transparent,
-      var(--md-sys-color-background)
-    );
-  }
 
   section {
     display: flex;

src/lib/components/Action.svelte

@@ -84,16 +84,6 @@
     border-right-width: 3px;
   }
 
-  .dynamic {
-    padding: 4px;
-    border-radius: 1px;
-    min-width: 8px;
-    background: var(--md-sys-color-surface-variant);
-
-    &.inline {
-      padding: 0px;
-    }
-  }
 
   .inline-kbd {
     margin-inline-end: 2px;